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Derivative Financial Instruments (Details) - Not designated as a hedge - Total return swap contracts $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) contract
Derivative Financial Instruments
Number of contracts \| contract	10		10		14
Notional value	$ 271,200		$ 271,200		$ 228,200
Cash collateral posted by counterparties	3,200		3,200
Cash collateral with the counterparties					3,700
Level 2
Derivative Financial Instruments
Net total return swap (liability) asset	2,017		2,017		(3,990)
Investment and other income (loss) \| Level 2
Derivative Financial Instruments
Net (losses) gains recognized in income	(14,191)	$ 135	(2,571)	$ (25,728)
Prepaid expenses and other current assets \| Level 2
Derivative Financial Instruments
Fair value - assets	$ 2,017		$ 2,017
Other current liabilities \| Level 2
Derivative Financial Instruments
Fair value - liabilities					$ 3,990